info: fix incorrect handling sdist inspection

Author: abn

src/poetry/inspection/info.py

@@ -490,7 +490,10 @@ def from_directory(cls, path: Path, disable_build: bool = False) -> PackageInfo:
         else:
             info = cls.from_metadata_directory(path)
 
-            if not info or info.requires_dist is None:
+            # unfortunately, we cannot yet trust that an empty or None requires_dist
+            # is trustworthy, this is largely due to requirements being not correctly
+            # populated in PKG-INFO and dynamically generated within setup.py file.
+            if not info or not info.requires_dist:
                 try:
                     if disable_build:
                         info = cls.from_setup_files(path)